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+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
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+  The licenses for most software and other practical works are designed
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+  16. Limitation of Liability.
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+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/README b/README
new file mode 100644
index 0000000..4a15a6b
--- /dev/null
+++ b/README
@@ -0,0 +1,27 @@
+usage: wator.py [-h] [-w WIDTH] [-v HEIGHT] [-f FISHCOLOR] [-s SHARKCOLOR]
+                [-b FISHBREED] [-c SHARKBREED] [-e SHARKENERGY]
+                [-g FOODENERGY] [-z ZOOM]
+
+Wa-Tor Implementation
+
+optional arguments:
+  -h, --help            show this help message and exit
+  -w WIDTH, --width WIDTH
+                        Width of the world
+  -v HEIGHT, --height HEIGHT
+                        Height of the world
+  -f FISHCOLOR, --fishcolor FISHCOLOR
+                        Color of the fish
+  -s SHARKCOLOR, --sharkcolor SHARKCOLOR
+                        Color of the shark
+  -b FISHBREED, --fishbreed FISHBREED
+                        Number of rounds that the fish need to breed
+  -c SHARKBREED, --sharkbreed SHARKBREED
+                        Number of rounds that the sharks need to breed
+  -e SHARKENERGY, --sharkenergy SHARKENERGY
+                        Number of energy points the sharks get at the
+                        beginning
+  -g FOODENERGY, --foodenergy FOODENERGY
+                        Number of energy points a shark earns when it eats a
+                        fish
+  -z ZOOM, --zoom ZOOM  Zoomimg factor
diff --git a/wator.py b/wator.py
new file mode 100755
index 0000000..ec215f3
--- /dev/null
+++ b/wator.py
@@ -0,0 +1,403 @@
+#!/usr/bin/python
+
+#
+#    Written by Casimo
+#    6th October 2013
+#
+#    This program is free software: you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation, either version 3 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+#
+
+import pygame
+import random
+import argparse
+from pygame.locals import *
+
+# Some constants
+GREEN = (0, 255, 0)
+BLUE = (0, 0, 255)
+BLACK = (0, 0, 0)
+WHITE = (255, 255, 255)
+
+EMPTY = 0 
+FISH = 1
+SHARK = 2
+
+DIR_UP = 0
+DIR_RIGHT = 1
+DIR_DOWN = 2
+DIR_LEFT = 3
+
+# Init random and pygame
+random.seed()
+pygame.init()
+
+# Small function to generate an empty map
+def clearmap(maprect):
+    worldmap = []
+    for j in range(maprect[0]):
+        worldmap.append([])
+        for i in range(maprect[1]):
+            worldmap[j].append(0)
+    return worldmap
+    
+#--------------------------------------------
+# Creature class
+#--------------------------------------------
+# The creature is a subclass of fish and sharks
+# it includes definitions on how to move, draw and grow
+class Creature(object):
+    # init the creature
+    def __init__(self, race, color, breedtime, width, height):
+        self.x = 0
+        self.y = 0
+        self.race = race
+        self.color = color
+        self.breedtime = breedtime
+        self.age = 0
+        self.width = width
+        self.height = height
+
+    # set the position on the map
+    def locate(self, worldmap, pos):
+        self.x = pos[0]
+        self.y = pos[1]
+
+        if worldmap[self.x][self.y] != EMPTY:
+            return False
+        else:
+            worldmap[self.x][self.y] = self.race
+            return True
+
+    # Draw a rectangle on the surface in the creature's color
+    def draw(self, surface, zoom):
+        pygame.draw.rect(surface, self.color, (self.x * zoom, self.y * zoom, zoom, zoom))
+
+    # returns the position after moving in direction
+    def getpos(self, direction):
+        if direction == DIR_UP:
+            newy = self.y - 1
+            newx = self.x
+        elif direction == DIR_RIGHT:
+            newx = self.x + 1
+            newy = self.y
+        elif direction == DIR_DOWN:
+            newy = self.y + 1
+            newx = self.x
+        elif direction == DIR_LEFT:
+            newx = self.x - 1
+            newy = self.y
+
+        # if the creature goes to the top/bottom/left/right, move it to the other edge
+        if newx == -1:
+            newx = self.width - 1
+        elif newx == self.width:
+            newx = 0
+
+        if newy == -1:
+            newy = self.height - 1
+        elif newy == self.height:
+            newy = 0
+
+        return (newx, newy)
+
+    # moves the creature to the new position and returns (in case of the shark) whether it has eaten a fish
+    def swim(self, worldmap, direction):
+        newpos = self.getpos(direction)
+
+        oldfield = worldmap[newpos[0]][newpos[1]]
+
+        # set the new position in the map
+        worldmap[newpos[0]][newpos[1]] = self.race
+        worldmap[self.x][self.y] = EMPTY
+        self.x = newpos[0]
+        self.y = newpos[1]
+    
+        return oldfield
+
+    # returns the creature at the position of the field in direction
+    def check(self, worldmap, direction):
+        newpos = self.getpos(direction)
+
+        return worldmap[newpos[0]][newpos[1]]
+
+    # advance it in age and return true if it's old enough to breed
+    def grow(self):
+        self.age += 1
+        if self.age == self.breedtime:
+            self.age = 0
+            return True
+        else:
+            return False
+
+#-----------------------------------------------------------------------
+# Fish class
+#-----------------------------------------------------------------------
+# The fish class is part of the world
+# it defines the corpus' definitions for a fish
+class Fish(Creature):
+    # init the corpus with the given values
+    #def __init__(self, width, height, color, breedtime):
+        #self.corpus = Creature(FISH, color, breedtime, width, height)
+
+    # swim checks for empty fields
+    def swim(self, worldmap):
+        # get a list of all empty fields
+        normdir = []
+        for j in range(4):
+            if super(Fish, self).check(worldmap, j) == EMPTY:
+                normdir.append(j)
+        
+        # and choose a random direction
+        if len(normdir) == 0:
+            # the fish cannot move
+            return False
+        else:
+            direction = random.choice(normdir)
+        super(Fish, self).swim(worldmap, direction)
+
+        return True
+
+    # check if the fish was eaten by a shark
+    def checkeaten(self, worldmap):
+        # in this case there is 'SHARK' instead of 'FISH' at the fish's position in the map
+        return worldmap[self.x][self.y] == SHARK
+
+#------------------------------------------------------------------
+# Shark class
+#------------------------------------------------------------------
+# The shark class is part of the world
+# it defines the corpus' definitions for a shark
+class Shark(object):
+    def __init__(self, width, height, color, energy, foodenergy, breedtime):
+        self.corpus = Creature(SHARK, color, breedtime, width, height)
+        self.energy = energy
+        self.foodenergy = foodenergy
+
+    def locate(self, worldmap, pos):
+        return self.corpus.locate(worldmap, pos)
+        
+    def draw(self, surface, zoom):
+        self.corpus.draw(surface, zoom)
+    
+    # swim to a fish or an empty field
+    def swim(self, worldmap):
+        # make a list of fields with fish
+        fishdir = []
+        # and another with empty ones
+        normdir = []
+        for j in range(4):
+            if self.corpus.check(worldmap, j) == FISH:
+                fishdir.append(j)
+            elif self.corpus.check(worldmap, j) == EMPTY:
+                normdir.append(j)
+        
+        # if there are fish around, get a random one
+        if len(fishdir) != 0:
+            direction = random.choice(fishdir)
+        elif len(normdir) == 0:
+            # there is no possible move
+            return False
+        else:
+            # otherwise just swim to an empty field
+            direction = random.choice(normdir)
+
+        if self.corpus.swim(worldmap, direction) == FISH:
+            # there was a fish, yummy
+            self.energy += self.foodenergy
+
+        return True
+
+    # higher level growing: does the shark have enough energy left?
+    def grow(self):
+        canbreed = self.corpus.grow()
+        self.energy -= 1
+        if self.energy == 0:
+            # RIP
+            return -1
+        return canbreed
+        
+#-------------------------------------------
+# World class
+#-------------------------------------------
+# The world class includes all fish and sharks
+# it defines the environment
+class World(object):
+    def __init__(self, worldrect, fishcolor, sharkcolor, backgroundcolor, fishbreed, sharkbreed, sharkenergy, foodenergy, zoom):
+        self.width = worldrect[0]
+        self.height = worldrect[1]
+        self.zoom = zoom
+        
+        self.fishcolor = fishcolor
+        self.sharkcolor = sharkcolor
+	self.backgroundcolor = backgroundcolor
+
+        self.fishbreed = fishbreed
+        self.sharkbreed = sharkbreed
+
+        self.sharkenergy = sharkenergy
+        self.foodenergy = foodenergy
+
+        self.fish = []
+        self.sharks = []
+
+        # get a random number of fish and sharks
+        numfish = random.randint(1, self.width * self.height / 2)
+        numsharks = random.randint(1, self.width * self.height / 2)
+        
+        # create an empty map
+        self.world = clearmap(worldrect)
+
+        for j in range(numfish):
+            # bear a fish
+            newfish = Fish(race = FISH, color = self.fishcolor, breedtime = self.fishbreed, width = self.width, height = self.height)
+
+            # and locate it on the map
+            pos = (random.randint(0, self.width - 1), random.randint(0, self.height - 1))
+            if newfish.locate(self.world, pos) == True:
+                self.fish.append(newfish)
+
+        for j in range(numsharks):
+            # bear a shark
+            newshark = Shark(color = self.sharkcolor, energy = self.sharkenergy, foodenergy = self.foodenergy, breedtime = self.sharkbreed, width = self.width, height = self.height)
+
+            # locate it on the map
+            pos = (random.randint(0, self.width - 1), random.randint(0, self.height - 1))
+            if newshark.locate(self.world, pos) == True:
+                self.sharks.append(newshark)
+
+    # drawing function
+    def draw(self, surface):
+        # draw the map to the screen
+        for k in range(self.height):
+            for j in range(self.width):
+                mytype = self.world[j][k]
+
+                if mytype == EMPTY:
+                    color = self.backgroundcolor
+                elif mytype == FISH:
+                    color = self.fishcolor
+                else:
+                    color = self.sharkcolor
+
+                pygame.draw.rect(surface, color, (j * self.zoom, k * self.zoom, self.zoom, self.zoom))
+
+    # play another round
+    def update(self):
+        # holds all new fish and sharks
+        allnewfish = []
+        allnewsharks = []
+
+        for fish in self.fish:
+            if fish.checkeaten(self.world) == True:
+                # a shark has eaten our fish
+                self.fish.remove(fish)
+                self.world[fish.x][fish.y] = EMPTY
+            else:
+                if fish.grow() == True:
+                    # a new fish is born
+                    newfish = Fish(race = FISH, color = self.fishcolor, breedtime = self.fishbreed, width = self.width, height = self.height)
+                    
+                    pos = (fish.x, fish.y)
+                    if fish.swim(self.world) == True:
+                        # move the old fish
+
+                        newfish.locate(self.world, pos)
+                        allnewfish.append(newfish)
+                else:
+                    # fish is not old enough -> just swim away
+                    fish.swim(self.world)
+        
+        # add new fish to the fishlist
+        self.fish.extend(allnewfish)
+    
+        for shark in self.sharks:
+            state = shark.grow()
+            if state == -1:
+                # the shark doesn't have enough energy
+                self.sharks.remove(shark)
+                self.world[shark.corpus.x][shark.corpus.y] = EMPTY
+            elif state == True:
+                # a new shark has to be born
+                newshark = Shark(color = self.sharkcolor, energy = self.sharkenergy, foodenergy = self.foodenergy, breedtime = self.sharkbreed, width = self.width, height = self.height)
+            
+                pos = (shark.corpus.x, shark.corpus.y)
+                if shark.swim(self.world) == True:
+                    # swim away, old fish
+                    newshark.locate(self.world, pos)
+                    allnewsharks.append(newshark)
+            else:
+                # nothing happend, just move
+                shark.swim(self.world)
+
+        # add new sharks
+        self.sharks.extend(allnewsharks)
+
+def parse_arguments():
+    # Parse arguments
+    parser = argparse.ArgumentParser(description = "Wa-Tor Implementation")
+    parser.add_argument('-w', '--width', help = "Width of the world", default = 100, type = int)
+    parser.add_argument('-v', '--height', help = "Height of the world", default = 50, type = int)
+    parser.add_argument('-f', '--fishcolor', help = "Color of the fish", default = 'blue', type = str)
+    parser.add_argument('-s', '--sharkcolor', help = "Color of the shark", default = 'green', type = str)
+    parser.add_argument('-a', '--backgroundcolor', help = "Background color", default = 'black', type = str)
+    parser.add_argument('-b', '--fishbreed', help = "Number of rounds that the fish need to breed", default = 4, type = int)
+    parser.add_argument('-c', '--sharkbreed', help = "Number of rounds that the sharks need to breed", default = 5, type = int)
+    parser.add_argument('-e', '--sharkenergy', help = "Number of energy points the sharks get at the beginning", default = 3, type = int)
+    parser.add_argument('-g', '--foodenergy', help = "Number of energy points a shark earns when it eats a fish", default = 1, type = int)
+    parser.add_argument('-z', '--zoom', help = "Zoomimg factor", default = 10, type = int)
+    args = parser.parse_args()
+    return args
+
+def game_loop(args):
+    # Check arguments
+    if args.zoom < 1 or args.zoom > 100:
+        print("Error: --zoom invalid")
+        exit(0)
+    if args.width < 0 or args.width > 1000 or args.height < 0 or args.height > 1000:
+        print("Error: --world invalid")
+        exit(0)
+    if args.fishbreed < 1 or args.fishbreed > 1000:
+        print("Errof: --fishbreed invalid")
+        exit(0)
+    if args.sharkbreed < 1 or args.sharkbreed > 1000:
+        print("Error: --sharkbreed invalid")
+        exit(0)
+    if args.sharkenergy < 1 or args.sharkenergy > 1000:
+        print("Error: --sharkenergy invalid")
+        exit(0)
+    if args.foodenergy < 0 or args.foodenergy > 1000:
+        print("Error: --foodenergy invalid")
+        exit(0)
+
+    # init the world
+    world = World((args.width, args.height), fishcolor = Color(args.fishcolor), sharkcolor = Color(args.sharkcolor), backgroundcolor = Color(args.backgroundcolor), fishbreed = args.fishbreed, sharkbreed = args.sharkbreed, sharkenergy = args.sharkenergy, foodenergy = args.foodenergy, zoom = args.zoom)
+    
+    # init the window
+    windowsize = (args.width * args.zoom, args.height * args.zoom)
+    display = pygame.display.set_mode(windowsize)
+    pygame.display.set_caption("Wa-Tor")
+
+    loop = True
+    # main loop
+    while loop == True:
+        world.update()
+        world.draw(display)
+        pygame.display.update()
+
+        for event in pygame.event.get():
+            if event.type == QUIT:
+                loop = False
+
+if __name__ == '__main__':
+    game_loop(parse_arguments())